About a load calculation -- Roller selection for a plate straightining maching

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Discussion Overview

The discussion revolves around the design and selection of components for a plate straightening machine intended for processing plates measuring 25x2100 mm. Participants are exploring the appropriate roller and gear selection, considering mechanical and operational parameters such as motor specifications and gear ratios.

Discussion Character

  • Technical explanation
  • Exploratory
  • Debate/contested

Main Points Raised

  • One participant seeks guidance on selecting rollers and gears for a plate straightening machine, providing motor specifications and asking for advice based on a center distance of 280 mm.
  • Another participant questions the dimensions provided, seeking clarification on the size and material of the plates, as well as the required straightness and measurement methods.
  • Some participants suggest conducting web research on plate rolling, emphasizing that the problem is more mechanical than electrical.
  • A detailed procedure for calculating the necessary power and gear ratio is proposed, outlining steps to determine energy requirements and adjustments needed for the motor and gear ratio.
  • One participant references a specific book on metal forming mechanics as a resource for understanding the calculations involved.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the specifics of roller and gear selection. There are multiple viewpoints regarding the approach to the problem, with some emphasizing mechanical aspects while others focus on the calculations needed for motor and gear specifications.

Contextual Notes

Participants express uncertainty regarding the dimensions and specifications of the plates, the material properties, and the exact requirements for straightness. The discussion includes assumptions about the mechanical processes involved in straightening the plates.

pankaj kishor verma
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i am making a plate straightining maching for 25x2100 mm plate.
motor- 30 hp and 960 rpm
worm reduction gear box- 100:1
Please tell me about the selection of roller by which i can straight the plate, and gear also.. if center distance between gear is 280 mm
 
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pankaj kishor verma said:
i am making a plate straightining maching for 25x2100 mm plate.
motor- 30 hp and 960 rpm
worm reduction gear box- 100:1
Please tell me about the selection of roller by which i can straight the plate, and gear also.. if center distance between gear is 280 mm
Welcome to the PF. :smile:

By your dimensions, are you saying the plates are 2 meters wide by 2.5cm thick? Or 2.5cm wide by 2 meters long (by how thick?)? What is the material? Have you worked with plate straightening machines in the past? How straight do you need the final product to be, and how will you measure it to be sure that it meets specifications?
 
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Do some web research on plate rolling. I think you will find that this is much more a mechanics problem than an electrical problem.
 
berkeman said:
Welcome to the PF. :smile:

By your dimensions, are you saying the plates are 2 meters wide by 2.5cm thick? Or 2.5cm wide by 2 meters long (by how thick?)? What is the material? Have you worked with plate straightening machines in the past? How straight do you need the final product to be, and how will you measure it to be sure that it meets specifications?
material is EN 8, wrongly any plate be bend , then i'll use this straightening machine,
to check the straightness of sheet, we set sensor at both outer side pinch roller
 
Dr.D said:
Do some web research on plate rolling. I think you will find that this is much more a mechanics problem than an electrical problem.
i know sir...but driver roller be connected through motor and worm reduction gear box, but i don't understand how i select gear box and motor for good job
 
The procedure is as follows:
1) Calculate the total amount of energy (plastic strain times yield stress) for the worst case straightening.
2) Calculate the time to pass that section through the straightening machine.
3) Divide total work by time to get power.
4) Multiply by a suitable safety factor to cover unknowns.
5) Compare to available power and gear ratio. Adjust the gear ratio or power as indicated, then go back to Step 2.
6) Repeat steps 2 through 5 until the motor and gear ratio meet the needs.

A book that covers Step 1 is Metal Forming, Mechanics and Metallurgy by Hosford and Caddell. There are probably better books available, that happens to be the one that I used in grad school If you need more detail, find an engineer that understands the procedure above. It is not practical to go into more detail in this forum.
 
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